So anyway, I'm listening to "The Moriarty Murder Mystery" episode (8th series, 17th episode, Jan 20 1958), when Moriarty and Grytpype-Thynne break into a silly singing song around 5 minutes into the sketch (aparently for money since you hear a copper get dropped into their tin mug by a passer-by). Finally, after listening to the song bit a few times (they only sing a few lines before the copper drops and they squable over who gets to hold it) I did a bit of searching on the web and here's what you hear them sing:

Who's kissable, who's lovable?
Miss Annabelle Lee
Who's wonderful, who's marvelous?
Miss Annabelle Lee (my Annabelle Lee)
(copper drops into cup)

This is actually a mangled version of "Miss Annabelle Lee (Who's Wonderful? Who's Marvelous?)" which was written back in circa 1942-1946 by Richman, Sidney Clare, Lew Pollack on the album "Unheard, Vols. 1 & 2: 1942-1946" (lyrics, 2nd version) in that they sing lines 3 and 4 before singing lines 1 and 2.

Well, it's all in the mind you know...